Before Using This Section
| Before using this section, you should have
performed the On-Board Diagnostic System Check and determined that:
- The Control Module and MIL (Malfunction Indicator Lamp) are operating
correctly.
- There are no Diagnostic Trouble Codes (DTCs) stored, or a DTC
exists but without a MIL.
Several of the following symptom procedures call for a careful visual
and physical check. The visual and physical checks are very important. The
checks can lead to correcting a problem without further checks which may save
valuable time.
|
Visual and Physical Checks
|
| • | Check the Control Module grounds for being clean, tight and in
their proper location. Refer to Powertrain Control Module (Control Modules)
. |
| • | Check the vacuum hoses for splits, kinks and proper connections,
as shown on the Vehicle Emission Control Information label. |
| • | Check thoroughly for any type of leak or restriction. |
| • | Check for air leaks at all the mounting areas of the intake manifold
sealing surfaces. |
| • | Check the ignition wires for the following conditions: |
| • | Check the wiring for the following items: |
| • | The following symptom tables contain groups of possible causes
for each symptom and cover several engines. The following symptom tables cover
several engines. The order of these procedures is not important. If the scan
tool readings do not indicate the problems, then proceed in a logical order,
easiest to check or most likely to cause first. In order to determine if a
specific vehicle is using a particular system or component, refer to the Control
Module Wiring Diagrams for an application. |
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